Band Lanczos

BandLanczosFactorization{T, S<:Number, SR<:Real} <: KrylovFactorization{T, S}

Band Lanczos factorization, same to KrylovKit.BlockLanczosFactorization except that the Krylov basis vectors can be chosen to be kept or not.

BandLanczosIterator{F, T, S<:Real} <: KrylovIterator{F, T}

Band Lanczos iterator.

BandLanczosIterator(operator, x₀::Block, maxdim::Int, tol::Real=1e-12; keepvecs::Bool=true)

Construct a BandLanczosIterator.

expand!(iter::BandLanczosIterator, state::BandLanczosFactorization) -> BandLanczosFactorization

Expand an BandLanczosFactorization.

initialize(iter::BandLanczosIterator) -> BandLanczosFactorization

Initialize a BandLanczosFactorization by a BandLanczosIterator.